- Plumbing, heating, air-conditioning (25)
- Painting and paper hanging (17)
- Electrical work (14)
- Masonry and other stonework (4)
- Terrazzo, tile, marble and mosaic work (3)
- Carpentry work (15)
- Floor laying and floor work, nec (6)
- Roofing, siding, and sheetmetal work (7)
- Concrete work (2)
- Water well drilling (1)
- Excavation work (4)
- Installing building equipment (1)
- Special trade contractors, nec (30)
